Hello Saikat,

You can refer to the topics like :

• Current Electricity. 7% questions. ...
• Heat and Thermodynamics. 6% questions. ...
• Electrostatics. 6% questions. ...
• Magnetic effect of Current and Magnetism. 6% questions. ...
• Work Energy Power. 5% questions. ...
• Wave Motion. 5% questions. ...
• Simple Harmonic Motion. 5% questions. ...
• Physics of Nucleus.

for wbjee also if you wanna learn more regarding the important topics.Then please read this article:

https://www.simplylearnt.com/topic-weightage/WBJEE-Engineering

Hope it helps you

Best of Luck